One of my memories at that time is that Jonas Salk walked into the lab, this primitive lab, while we waited for the renovation being finished. And so I was introduced to Jonas and ultimately we became... we became well known to each other. But at the initial meeting, since by this time he gained a considerable... considerable notoriety but was not really known to the public as well as he was of course after the vaccine was accepted. But we did become somewhat casual friends.

Leonard Hayflick (b. 1928), the recipient of several research prizes and awards, including the 1991 Sandoz Prize for Gerontological Research, is known for his research in cell biology, virus vaccine development, and mycoplasmology. He also has studied the ageing process for more than thirty years. Hayflick is known for discovering that human cells divide for a limited number of times in vitro (refuting the contention by Alexis Carrel that normal body cells are immortal), which is known as the Hayflick limit, as well as developing the first normal human diploid cell strains for studies on human ageing and for research use throughout the world. He also made the first oral polio vaccine produced in a continuously propogated cell strain - work which contributed to significant virus vaccine development.